A Class of Renormalization Group Invariant Scalar Field Cosmologies

Details A Class of Renormalization Group Invariant Scalar Field Cosmologies A Class of Renormalization Group Invariant Scalar Field Cosmologies

2003-03-18

arxiv.org/abs/hep-th/0303154v2

Gen.Rel.Grav. 35 (2003) 1899-1907

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, RevTex4, no figures, to appear on GRG

Scientific paper

We present a class of scalar field cosmologies with a dynamically evolving Newton parameter $G$ and cosmological term $\Lambda$. In particular, we discuss a class of solutions which are consistent with a renormalization group scaling for $G$ and $\Lambda$ near a fixed point. Moreover, we propose a modified action for gravity which includes the effective running of $G$ and $\Lambda$ near the fixed point. A proper understanding of the associated variational problem is obtained upon considering the four-dimensional gradient of the Newton parameter.

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